filter
(1)过滤
(2)滤光器，滤光片，滤光镜
(3)滤波器
(4)过滤器

• coronagraphy
• coronal
• coronal holes
• coronene
• coross
• corpuscle
• corpuscular
• corpuscular emission
• corpuscular nature of light
• corpuscular theory
• corpuscular type
• corrected diffraction efficiency
• corrected gear
• corrected lens
• corrected value
• correct exposure
• correcting collar
• correcting device
• correcting lens
• correcting mount
• correcting plate
• correction
• correction curve
• correction factor
• correction filter